Experimental method for <i>in situ</i> determination of material textures at simultaneous high pressure and high temperature by means of radial diffraction in the diamond anvil cell

Liermann, Hanns‐Peter; Merkel, Sébastien; Miyagi, Lowell; Wenk, Hans‐Rudolf; Shen, Guoyin; Cynn, Hyunchae; Evans, W. J.

doi:10.1063/1.3236365

Cited by 44 publications

(44 citation statements)

References 47 publications

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“…At present, works are under way to extend the measurements into several directions: (i) larger P, T, and composition ranges [245,270]; (ii) finer interpretation of the experimental data with polycrystal plasticity models [253]; and (iii) complex deformation history, such as sinusoidal oscillations [283]. These works will allow, in the future, clarifying the combined effects of P and T on MgO and (Mg,Fe)O plasticity.…”

Section: Experimental Identification Of Individual Deformation Mechanmentioning

confidence: 99%

“…A limitation of the DAC is that pressure and deformation cannot be decoupled. Despite these limitations, the DAC is a useful tool for investigating plastic properties up to 300 GPa at ambient temperature [244] with developments under way to allow for performing high-T experiments, either using resistive heating elements [245] or lasers [246]. Stress in DAC experiments is typically assumed to be axial with cylindrical symmetry around the compression direction [247] and with low pressure gradients across the sample.…”

Section: Experimental Devicesmentioning

confidence: 99%

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Dislocations and Plastic Deformation in MgO Crystals: A Review

et al. 2018

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This review paper focuses on dislocations and plastic deformation in magnesium oxide crystals. MgO is an archetype ionic ceramic with refractory properties which is of interest in several fields of applications such as ceramic materials fabrication, nano-scale engineering and Earth sciences. In its bulk single crystal shape, MgO can deform up to few percent plastic strain due to dislocation plasticity processes that strongly depend on external parameters such as pressure, temperature, strain rate, or crystal size. This review describes how a combined approach of macro-mechanical tests, multi-scale modeling, nano-mechanical tests, and high pressure experiments and simulations have progressively helped to improve our understanding of MgO mechanical behavior and elementary dislocation-based processes under stress.

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Section: Experimental Identification Of Individual Deformation Mechanmentioning

confidence: 99%

Section: Experimental Devicesmentioning

confidence: 99%

Dislocations and Plastic Deformation in MgO Crystals: A Review

et al. 2018

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“…The first run was performed at HPCAT beamline 16-ID-B in a modified Mao-Bell DAC with 70° lateral openings for radial diffraction (Liermann et al 2009). The sample was loaded into a boron epoxy gasket inside of a Kapton insert (Merkel and Yagi 2005).…”

Section: Runmentioning

confidence: 99%

Preferred orientation in experimentally deformed stishovite: implications for deformation mechanisms

et al. 2014

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“…To this day, the determination of active deformation mechanisms in iron at core conditions remains an active field of research (Poirier and Price, 1999;Wenk et al, 2000b;Merkel et al, 2004;Miyagi et al, 2008;Liermann et al, 2009) and more experiments will be needed to properly constrain those parameters.…”

Section: Plastic Propertiesmentioning

confidence: 99%

Texturing in Earth’s inner core due to preferential growth in its equatorial belt

Deguen¹,

Cardin²,

Merkel³

et al. 2011

Physics of the Earth and Planetary Interiors

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We propose an extension of the model by Yoshida et al. (1996), where deformation in the inner core is forced by preferential growth in the equatorial belt, by taking into account the presence of a stable compositional stratification. Stratification inhibits vertical motion, imposes a flow parallel to isodensity surfaces, and concentrates most deformation in a shallow shear layer of thickness ∼ B −1/5 , where B is the dimensionless buoyancy number.The localization of the flow results in large strain rates and enables the development of a strong alignment of iron crystals in the upper inner core. We couple our dynamical model with a numerical model of texture development and compute the time evolution of the lattice preferred orientation of different samples in the inner core. With sufficient stratification, texturing is significant in the uppermost inner core. In contrast, the deeper inner core * Corresponding authorEmail address: philippe.cardin@ujf-grenoble.fr (Philippe Cardin ) Preprint submitted to Physics of the Earth and Planetary Interiors June 10, 2011is unaffected by any flow and may preserve a fossil texture. We investigate the effect of an initial texture resulting from solidification texturing at the ICB. In the present inner core, the deformation rate in the shallow shear layer is large and can significantly alter the solidification texturing, but the solidification texture acquired early in the inner core history can be preserved in the deeper part. Using elastic constants from ab initio calculations, we predict different maps of anisotropy in the modern inner core. A model with both solidification texturing and subsequent deformation in a stratified inner core produces a global anisotropy in reasonable agreement with seismological observations.

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Experimental method for in situ determination of material textures at simultaneous high pressure and high temperature by means of radial diffraction in the diamond anvil cell

Cited by 44 publications

References 47 publications

Dislocations and Plastic Deformation in MgO Crystals: A Review

Dislocations and Plastic Deformation in MgO Crystals: A Review

Preferred orientation in experimentally deformed stishovite: implications for deformation mechanisms

Texturing in Earth’s inner core due to preferential growth in its equatorial belt

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